K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2015-01-02T01:05:08.773677Z
K 7
svn:log
V 309
Callers of pmap_kextract() cannot distinguish between failure and
physical address zero.  Assume that the lowest page is always mapped
by direct map.

This restores access to the page at zero through /dev/mem after
r263475.

Reported and tested by:	neel
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END